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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Income from continuing operations $ 675 $ (576) $ 633 $ 860 $ 1,006 $ 1,378 $ 1,798 $ 1,825 $ 1,592 $ 6,007 $ 8,523
Income from discontinued operations, net of income taxes 0 0 54 1,884 (63) 241 222 224 1,938 624 2,341
Net income $ 675 $ (576) $ 687 $ 2,744 $ 943 $ 1,619 $ 2,020 $ 2,049 $ 3,530 $ 6,631 $ 10,864
Denominator:                      
Weighted average common shares (in shares)                 12,882,000 13,997,000 14,722,000
Effect of dilutive securities: stock options (in shares)                 12,000 0 0
Diluted weighted average common shares (in shares)                 12,894,000 13,997,000 14,722,000
Income per share—basic:                      
Continuing operations (in dollars per share) $ 0.05 $ (0.05) $ 0.05 $ 0.07 $ 0.07 $ 0.10 $ 0.13 $ 0.13 $ 0.12 $ 0.43 $ 0.58
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.14 0.00 0.02 0.01 0.01 0.15 0.04 0.16
Net income per share, basic (in dollars per share) 0.05 (0.05) 0.05 0.21 0.07 0.12 0.14 0.14 0.27 0.47 0.74
Income per share—diluted:                      
Continuing operations (in dollars per share) 0.05 (0.05) 0.05 0.07 0.07 0.10 0.13 0.13 0.12 0.43 0.58
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.14 0.00 0.02 0.01 0.01 0.15 0.04 0.16
Net income per share, diluted (in dollars per share) $ 0.05 $ (0.05) $ 0.05 $ 0.21 $ 0.07 $ 0.12 $ 0.14 $ 0.14 $ 0.27 $ 0.47 $ 0.74
Antidilutive securities excluded from computation of earnings per share (in shares)                 550,000 600,000 775,000